Editing Single instruction, single data (section)

{{Short description|Class of computer architecture}}
{{Flynn's taxonomy}}
[[Image:SISD.svg|right|225px]]

In [[computing]], '''single instruction stream, single data stream''' ('''SISD''') is a [[computer architecture]] in which a single uni-core [[Processor (computing)|processor]] executes a single instruction stream, to operate on data stored in a single memory. This corresponds to the [[von Neumann architecture]].

SISD is one of the four main classifications as defined in [[Flynn's taxonomy]]. In this system, classifications are based upon the number of '''concurrent''' instructions and data streams present in the computer architecture. According to [[Michael J. Flynn]], SISD can have concurrent processing characteristics. [[Pipelined processor]]s and [[superscalar processor]]s are common examples found in most modern SISD computers.<ref>Quinn, Michael J. Chapter 2: Parallel Architectures, ''Parallel Programming in C with MPI and OpenMP''. Boston: McGraw Hill, 2004.  {{ISBN|0-07-282256-2}}</ref><ref>Ibaroudene, Djaffer. Chapter 1: Motivation and History, ''Parallel Processing''. St. Mary's University, San Antonio, TX. Spring 2008.</ref>

Instructions are sent to the control unit from the memory module and are decoded and sent to the processing unit which processes on the data retrieved from memory module and sends back to it.